Lathe control movement



Jan. 3, 1950 G. E. CUTTAT 2,493,621

LATHE CONTROL MOVEMENT Filed Dec. 28, 1946 v Fr? IN VE N TOR fieorgesEmi/e (L/i222 A TT RNEY Patented Jan. 3, 1950 LATHE CONTROL MOVEMENTGeorges Emile Cuttat, Geneva, Switzerland, assignor to Manufacture deMachines du Haut- Rhin, Haut-Rhin, France, a company of FranceApplication December 28, 1946, Serial No. 719,085 In France August 3,1939 Section 1, Public Law 690, August 8, 1946 Patent expires August 3,1959 2 Claims.

The present invention relates to the control of the spindle carryingpoppets in automatic lathes.

The control of the longitudinal displacement of these poppets hasalready been realized by means of levers, inclined planes or leverscontrolled by slides. However, in all the devices used heretofore, anumber of the control elements were subjected to torsional or flexuralstresses, especially in case where the slide is controlled directly by acam. In such a case, there resulted abnormal stresses on the whole ofthe device. In accordance with the present invention, these drawbacksare avoided; the control is ensured by means of two levers rotating intwo planes perpendicular to each other and by a slide, transmitting themotion of one of the levers to the other, said slide being moved by oneof the levers in the plane of the latter and engaging the extremity ofthe other lever arranged in a perpendicular plane.

In this way, the axles of the two levers are subjected only to stressesnormal to them and which it is easy to take into account by thedimensioning of these axles, with the exclusion of any lateral reactioncausing torsional effects on these axles and the parts they carry.

One type of embodiment of the control device which is the object of theinvention will be described hereinafter by way of example, withreference to the appended drawing in which:

Figure 1 is an end view of the device;

Figure 2 is a side elevation thereof;

Figure 3 is a plane View, and

Figure 4 shows part of an alternate control device.

It can be seen (Figures 1 to 3), that lever I, capable of turning aroundan axis 5 on the frame of the machine, in a vertical plane, receives itsmotion, through roller 2, mounted at its end, from a control cam 3,receiving its rotary motion in any appropriate manner. Lever I, presentsan upper branch with a roller 4, acting on a thrust block I, provided,on the edge of a notch made in a slide 6, capable of a rectilineardisplacement upon an appropriate guide of the frame, in the plane oflever I. This slide is fitted with a thrust block I5, acting on roller 8placed at the end of one of the arms of two arm lever 9, capable ofoscillating about vertical pivot I0, mounted on the frame.

The other lever 9 presents a slide along which bushing I6, provided witha push element II acting directly on poppet I I can be fixed in variouspositions.

It will be clear that the above described control device acts in onesense only, that indicated by arrow f in Figure 1; in the other sense,the motion is ensured in a known manner by a spring or any appropriatecounter-weight.

The mode of operation is easy to understand. Cam 3, upon turning, swingslever I towards the left (Figure 1) and the latter moves slide 6 in thesame direction. The latter, by its thrust block I5, acts on roller 8 oflever B, which turns about axis I0. Push element II acts on the poppetwhich it displaces longitudinally. It is clear that the amplitude ofdisplacement of the poppet will vary according to the position occupiedby bushing I6, inside the slide I 2.

It must be noted that with such a device, free of torsional stresses, itis possible to multiply, without any disadvantage, the stroke given tothe cam to obtain a longer displacement of the poppet, while, with knowndevices, a ratio of 1:1 could not be exceeded with respect to thedisplacement imparted by the cam.

It is clear that levers I and 9 could have different positions providedthey remain in two planes, perpendicular to each other, and that thereexists an intermediate slide transmitting motion from one to the other.

For certain precision jobs, and to avoid having to design toocomplicated a cam profile, two twin cams 3, 3, can be used, as alreadyknown in other types of control (Figure 4), one of which acts on leverI, and the other on lever I. Lever I comprises a thrust screw I9, sothat lever I can drive lever I". According to the profiles of cams 3'and 3", it is now the one, then the other which controls the motion ofthe slide.

What I claim is:

1. A longitudinal control device of the poppet in automatic lathescomprising at least one cam, the plane whereof is perpendicular to theaxis of the poppet, a lever receiving its motion in the same plane fromsaid cam, a roller mounted on the operative end of said lever, a slidemovable perpendicularly to the axis of the poppet, a thrust block onsaid slide engaged by said roller, a second thrust block on said slide,a second lever moving in a plane perpendicular to the plane of motion ofsaid first lever, a roller mounted on one arm of said second lever andengaged by said second thrust block, whilst the other arm of said secondlever exerts a pushing action on the poppet.

2. A longitudinal control device of the poppet in automatic lathes, twocoaxial earns the planes of which are perpendicular to the axis of the asecond thrust block on said slide, a third lever adapted to move in aplane perpendicular to the plane of motion of said first levers, aroller mounted on one arm of said third lever and en- 10 gaged by saidsecond thrust block, whilstthe other arm of said third lever exerts apushing action on the poppet.

GEORGES CU'IITAT..

4 REFERENCES CITED The following references are of record in the fileof, this patent:

UNITED STATES. PATENTS Number Name Date 651,828 Copland June 19, 19001,345,497 Kempin July 6, 1920 2,368,793 Wilson Feb. 6, 1945 FOREIGNPATENTS Number 7 Country Date Switzerland Apr. 16, 1928

